Display screen with a graphical user interface



FIG. 1 is a front view of a display screen with a graphical user interface showing our new design; and,

FIG. 2 is a front view of the design shown in FIG. 1 in a different environment.

The broken lines at the peripheries of the figures illustrate a display, and the remainder of the broken lines in the figures illustrate portions of the graphical user interface. None of the broken lines form part of the claimed design. 

CLAIM The ornamental design for a display screen with a graphical user interface, as shown and described. 